Filter unit and method of making same



July 3, 1928.

A. L. HANSEN FILTER UNIIYAND METHOD OF MAKING SAME Filed July 28, 1926 2 Sheets-Sheet July 3, 1928. 1,676,024

A. HANSEN FILTER UNIT AND METHOD OF MAKING SAME Filed July 28, 1926 2 sheets-sheet 2 Patented July 3, 1928.-

1,676,024 ICE.

AUGIE L. HANSEN, OF CHICAGO, ILLINOIS,

v CHICAGO,

ASSIGNOR TO HERBERT S.

STRAUSSER, OF ILLINOIS. I

FILTER UNIT AND METHOD OF MAKING SAME.

Application filed July 28,

This invention relates to improvements in filter units, and to an improved method of constructing and assembling the parts of a filter unit.

6 The term' filter unit as herein used, applies more particularly to that part of a "filter which embodies the screen of filtering material, and supports it in permanent she so that it can be removed and replaced wit in the filter receptacle as an mdependent and self-sustaining element. The type of filter to which the present disclosure relates, is one designed for the filtering of gasoline and as an assembly for the fuel supply system of' an automobile, although the novel features herein disclosed may be usedto equal advantage in other filters as well as other devices.

The object of the inventionis to provide a novel assembly for a filtering unit, with a view to decreasing the cost of maunfacture, and to otherwise simplify the problem fof production.

In the accompanying drawings, I Figure 1 is a view in elevation of a filter of the type utilizing a unit of the present invention. Figure 2 is a perspective view of the filter \{unit removed. 80

on line 3-3 of Figure 2.

Figured is a top plan view of the outer base member of the unit.

Figure 5 is a cross-sectional view of the outer base member taken on line 5-5 of Figure 4.

Figure 6 isa top plan view of the inner base member of the, unit.

Figure 7 is a cross-sectional view of the inner base member as taken on line 7-7 of Figure 6. i

Figure 8 is an enlarged detail view in section as taken on line 8-8 of Figure 6.

Figures 9,10 and 11 are views in elevation of the three'U-shaped frame members.

Figure 12 is a perspective view illustrating the manner in which frame members and inner base member are assembled.

-Fi'gure 13 is a view in vertical section through the parts of the filter unit, when assembled. z

'Figures 14 and 15 are enlarged detail views showing the manner in which the ends of the frame members are secured to the inner base member when the unit is Figure 3 is a view in cross-section taken inner ring or other suitable metal may be'used.

the ring, is a plurality o 1926. Serial No. 125,861.

- prises a glass receptacle 1, open at its top and closed by a metal cap 2. Within the receptacle is a filtering unit 3, seating at its upper margin in a shoulder 1 around the top of the receptacle and bearing against a washer 4 between the edge of the receptacle and the cap. Inlet and outlet pipes 5 and, 6 have connection Withthe receptacle through the cap, there being passages arranged for conducting the liquid into the receptacle and thence through the filtering material to thedischarge pipe. The receptacle and cap are'held together bya U-strap 7 secured to the .edge of the cap and extendingaround the receptacle with a threaded stem 8 bearing against the bottom thereof.

As shown-in Figure 2, the filtering unit comprises a circular base member 9 at its upper end and a depending body portion o a generally conical shape, which as shown in Figure 3,"consists of a sheet '10'of relatively pliable filtering material, such as chamois, stretched over a skeleton frame,

made up of members later to be described. Referring now to the construction of the filter units, the base member 9 is a twoart disc consisting of'an outer ring 11 an an 4 plate 12, both stamped from sheet metal of relatively thin gauge, the metal being preferably brass although any The outer ring 11 is circular about its periphery, or outer edge, and its inner edge or internalmargin is formed in a series of I regular convolutions of alternatereversed lobeswith a continuous flange 11 of about inch in width extending throughout the convolutions. Between the outwardly ex, tending lobes and spaced e uidistantly about holes 11*. 4 he-inner ring 12 has its outer edge 0r.1 0 periphery fluted and flanged to conform exactly with the inner edge of the outer v ring 11, so that the two parts may be fitted together with a press fit. The outer flanged pairs of depressed lugs extending radially and forming on the under side of the ring, downwardly facing notches or recesses 12",

as clearly shown in Figure 8. The purpose of the slots and lugs will be presently disc ose The skeleton frame of the unit is made up of three U-shaped frame members 13, 14 and 15 as shown in Figures 9, 10 and 11, respectively. These members, are preferably flat;

bars bent edgewise with their end portions slightly divergent. Frame members 13 and 14 are duplicates of each other, differing only in the location of notches which are cut in the lower portions thereof.- Thus member 13 has a narrow notch 13 cut in its low er edge and facin downwardly, whereas 'memher 14 has a similar notch 14 in the correspondin position in its 11' per edge. Thede th 0 these notches is sulistantially one-hal the width of the bars and the width equal to their thickness. The third frame member 15 differs from the two in that its branches are slightly longer and their extremities are slotted lengthwise for a short distance as at 15", 15. Moreover, the notch 15 at its lower end is twice as wide as the other notches, although it faces upwardly as in the frame member 14.

Figure 12 illustrates the manner of uniting the frame members 13, 14 and 15 and the inner rin 12, this being the first step in the assembling operation. Holding the ring" 12 stationary in a suitable-support, a

frame member 13 is applied against the under side of the ring with its ends fitting in one pair of notches 12 in the manner shown in Figure 14. Then a'frame member 14 is applied with its ends in the other pair of notches 12 and with its notch 14 interlocking with the notch 13 of the first frame member 13. 'In this position, the planes of the two members 13 and 14 are I displaced through an angle of 60. Finally, the frame member 15 is applied, by 55" inserting its slotted ends 15 through the slots 12 with its notch 15 straddling the lower portions of the interlocked frames 13 and 14. Thus by bending over the portions of the slotted ends 15 which projects through .the slots 12 after the manner shown'in'fFigure 15, the frame members, are rigidly fixed to the inner ring 12.

The'next step in the assembling process is the applicatlon of the filtering medium over the skeleton frame and applying the outer ring 11. This may be accomplished either by hand or a punch press operation in somewhat the following manner: A circular piece of the material, chamois, for instance, is laid over the outer ring and concentric therewith and then the assembled frame and inner ring 12 is passed through the outer ring, vuntil the inner ring is pressed home into its seat within the outer ring, the two complementary flanges 11 and 12 interfitting with the margins of the filtering material tightly held between them. In this manner, the material is drawn taut giving it the fluted appearance when completed. If there isany excess material beyond the rings, this can be trimmed ofi' flush with the plane of the top faces ofthe rings. The flanges having some degree of resiliency, are distorted by the wedging of the material between the edges of the rings, thus producing a frictional interlocking of the parts together as a rigid unit withoutthe use of other lockprovide a flange for supporting the com plete unit within its seat in the receptacle.

.Moreover, the same method may be employed where a relatively stiff filtering material is used, such as wire mesh, which would ordinarily not require a frame to support it. Thus the frame members could be readily eliminated and the edges secured between interfitting rings as herein set forth, and which may have circular flanged edges or any other. conformation desired.

For these reasons, I do not intend to limit the invention to the specific disclosure herein made.

I claim as my invention:

1. An article of manufacture for the purpose described, comprising a disc consisting of a ring and a circular plate having interpose described, comprising-a disc consisting of an outer ring and an inner plate having complementary flanged edges, skeleton frame members secured at their ends to said inner plate, and a covering of pliable material stretched over said frame'and its mar- I gins frictionally secured between the flanged edges of said ring and plate.

3. An article of manufacture for the purpose 'described,comprisingt'a two-part disc frame through a ring having internal mar- I consisting of an'outer ring and an inner ring gins conforming to the flanged margins of 40 havin V interfittin marginal flanges, skelsaid frame, and pressing said ring and eton irame mem ers having interlockingframe together. connection with said inner ring, and a screen 7. A method of constructing a rigid frame of relatively liable filtering material .fitstructure includin walls of a relatively pliting otter sai frame and having its edges able material consisting of providing atwo- 45 securedbetween the flanged edges ofsaid part disc divided along complementary outer and inner discs. f flanged edges, securing a skeleton frame a 4. Afiarticle of manufacture for the pur consisting of a plurality of U-shaped frame pose described, comprising a two-part (1180 members to the inner member of said disc,

consisting of an outer ring and an inner applying a piece of pliable material over ring having inter-fitting marginal flanges, a said frame to enclose the flanged edges of frame consisting of a plurality of U-shaped said inner member of the disc, and passing bars havinginterlocking connection at their the covered frame through the outer meinlower ends and rigid connection with said ber of the disc and pressing the same to- 4 inner ring at their free ends, and a covering gether into interfitting engagement. 55 of pliable material over said frame having 8. A method of constructinga rigid frame itsfr eeedges secured between the flanged structure including walls of a relatively pliedges of said rings. v able material consisting of providing a two- 5. A method of constructing a rigid filpart disc divided along complementary 4 term unit including a screen of relatively flanged edges, providing a frame consisting pliab e material consisting of providing a of U-shaped bars, assembling said frame two-part disc adapted to be omedalong members into skeleton frame and connecting internal and external flanged edges, securthe same to the inner member of said disc ing skeleton frame members in abutting enby in sertin the'ends of one bar through gagement with one part of said disc, applyslots in sai member, and bending the ends ing the pliable material over said frame, and over on the opposite side thereof, applying pressing said disc parts together with the. a piece of pliable material 'over said-frame marginal portions of said screen therebeto enclose the flanged edges of said inner t i I i t member of the disc, and passing'the cov- 6. A method of constructing a rigid frame ered frame through the outer'member of the 70 structure including walls of a relatively plidisc until said members are brought into able material consisting, of providing'a rigid interfitting en agement. v skeleton frame having a flanged margin ex- Signed at O 'cago, Ill., this 22nd day of tending around said frame, applying a piece July, 1926. a of the pliable material over said frame and against. said. flanged margins, passing said AUGIE L. HANSEN. 

